CN112286236A - Heliostat azimuth angle control device and method - Google Patents
Heliostat azimuth angle control device and method Download PDFInfo
- Publication number
- CN112286236A CN112286236A CN202011205612.6A CN202011205612A CN112286236A CN 112286236 A CN112286236 A CN 112286236A CN 202011205612 A CN202011205612 A CN 202011205612A CN 112286236 A CN112286236 A CN 112286236A
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- displacement sensor
- heliostat
- rope displacement
- stay
- assembly
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/47—Mountings or tracking
Abstract
The invention discloses a heliostat azimuth angle control device, which comprises: a base; the driving assembly is arranged on the base, and the rotating part is provided with a circumferential surface; the heliostat assembly is arranged on the rotating part, and the driving assembly drives the heliostat assembly to rotate; the pull rope displacement sensor A and the pull rope displacement sensor B are respectively provided with a pull rope displacement sensor A and a pull rope displacement sensor B, wherein the open ends of the pull ropes are fixedly connected with the rotating part, the bodies of the pull ropes are fixedly connected with the fixing part of the driving assembly, and the rotating part drives the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B to stretch; the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B are tightly attached to the circumferential surface, and the arcs formed by the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B are coaxial with the rotation center of the rotating part; and in the rotation process of the heliostat assembly, converting the length value of the pull rope displacement sensor A and/or the pull rope displacement sensor B into an angle value to obtain the azimuth angle of the heliostat assembly. The accurate positioning of the orientation angle of the heliostat assembly can be realized, and the winding problem of the heliostat assembly can be prevented.
Description
Technical Field
The invention belongs to the technical field of angle control, and particularly relates to a heliostat azimuth angle control device and method.
Background
While the economy is continuously developed, the energy is in short supply day by day, the traditional non-renewable energy is exhausted day by day, the economic development is more and more limited by the development and utilization of the energy, the utilization of the renewable energy is generally concerned, and particularly, the solar energy is more concerned by people in the world.
Solar thermal power generation is one of the main ways in which solar energy is currently utilized. The current solar thermal power generation can be divided into tower type solar thermal power generation, trough type solar thermal power generation and disc type solar thermal power generation according to a solar energy collection mode. The solar thermal power generation is that the energy of the direct solar light is gathered by a large number of reflecting heliostats in a focusing mode, a working medium is heated, high-temperature and high-pressure steam is generated, a steam turbine is driven by the steam to generate power, the heliostats are an important component of a tower type solar thermal power generation system, and the heliostats play a key role in utilizing the sunlight.
The conventional heliostat angle generally adopts a relative angle value, and one of the disadvantages of the adoption of the relative angle is that the angle value needs to be stored in a power-off mode, and when the angle access fails, the current angle value is inconsistent with the actual angle, namely the angle is deviated; secondly, when the reference position of the heliostat deviates, the heliostat also causes angle deviation; if the wire winding problem appears very easily in the heliostat in pursuing the sun or the corner process angle skew problem, the cable winding can lead to being connected relevant equipment with the cable and dragging the damage, then can cause the heliostat mirror surface breakage seriously, has not only reduced the operating efficiency, has still increased the maintenance cost.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an azimuth angle control apparatus and method for a heliostat assembly, in which an absolute angle is used, so that the accurate positioning of the azimuth angle of the heliostat assembly can be realized, and the problem of winding of the heliostat assembly can be prevented.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a heliostat azimuth control apparatus comprising:
a base;
the driving assembly is arranged on the base and provided with a rotatable rotating part and a non-rotatable fixing part, and the rotating part is provided with a circumferential surface;
the heliostat assembly is arranged on the rotating part, and the driving assembly drives the heliostat assembly to rotate;
the pull rope displacement sensor A and the pull rope displacement sensor B are respectively provided with a pull rope displacement sensor A and a pull rope displacement sensor B, wherein the open ends of the pull ropes; the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are tightly attached to the circumferential surface, and the arcs formed by the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are coaxial with the rotation center of the rotating part;
when the heliostat assembly is in a zero point position, the open ends of the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are projected and superposed in the axial direction of the rotation center of the rotating part, and the rest parts of the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are not superposed; and in the rotation process of the heliostat assembly, converting the length value of the pull rope displacement sensor A and/or the pull rope displacement sensor B into an angle value to obtain the azimuth angle of the heliostat assembly.
According to an embodiment of the present invention, the driving assembly is a rotary speed reducer.
According to an embodiment of the present invention, the bodies of the stay rope displacement sensor a and the stay rope displacement sensor B are symmetrically arranged along the radial direction of the circumferential surface, and when the heliostat assembly is at the zero point position, the open ends of the stay ropes of the stay rope displacement sensor a and the stay rope displacement sensor B are located at the middle position of the bodies.
Based on the same concept, the invention also provides a heliostat azimuth angle control method, based on the heliostat azimuth angle control device, comprising:
step 1: adjusting the heliostat assembly to a zero point position, and calibrating the azimuth angle of the heliostat assembly at the position to be 0 degree;
step 2: the values of the pull rope displacement sensor A and the pull rope displacement sensor B are respectively N when the zero point position is recordedAAnd NBWhen the zero point position is obtained through measurement, the arc angles corresponding to the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B are respectively thetaAAnd thetaBAnd the values of the stay rope displacement sensor A and the stay rope displacement sensor B are respectively L in the rotation process of the heliostat componentAAnd LB；
Step 3: when L is measured in the rotation process of the heliostat componentA-NA＞LB-NBThe azimuth angle θ of the heliostat assembly is:
when L is measured in the rotation process of the heliostat componentA-NA＜LB-NBThe azimuth angle θ of the heliostat assembly is:
according to an embodiment of the invention, the angle theta is measured by the angle acquisition module in Step2AAnd thetaB。
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
(1) the embodiment of the invention is provided with the base, the driving assembly, the heliostat assembly, the stay cord displacement sensor A and the stay cord displacement sensor B, and the azimuth angle of the heliostat assembly is obtained by converting the stay cord length value of the stay cord displacement sensor A and/or the stay cord displacement sensor B into the angle value, so that the control of the azimuth angle of the heliostat is realized, the measured value is an absolute value and is more accurate, and the problem of angle deviation cannot occur.
(2) According to the method, the azimuth angle of the heliostat assembly is measured through the steps from Step1 to Step3, the method uses an absolute angle mode, the accurate positioning of the azimuth angle of the heliostat assembly can be achieved, the azimuth angle is positive and negative, and the problem of winding of the heliostat assembly can be prevented.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic overall view of a heliostat azimuth control apparatus and method of the invention;
FIG. 2 is a cross-sectional view of a heliostat azimuth control apparatus and method of the invention;
FIG. 3 is a schematic diagram of a zero position of a heliostat azimuth control apparatus and method of the invention;
FIG. 4 is a schematic diagram of a heliostat azimuth angle control apparatus and method of the invention with a positive 180 degree azimuth angle;
fig. 5 is a schematic diagram of the heliostat azimuth angle control apparatus and method of the invention when the azimuth angle is minus 180 degrees.
Description of reference numerals:
1: a base; 2: a rotating part; 3: a fixed part; 4: a push rod; 5: mounting a rod; 6: a mirror surface; 7: a pull rope displacement sensor A body; 8: a pull rope displacement sensor B body; 9: pulling a rope by a rope displacement sensor A; 10: pulling the rope of the rope displacement sensor B; 11: one end of the pull rope is opened; 12: a zero position.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Example 1
Referring to fig. 1 to 5, the core of the present invention is to provide a heliostat azimuth control device, which comprises a base 1, a driving assembly, a heliostat assembly, a stay cord displacement sensor a and a stay cord displacement sensor B. The driving assembly is arranged on the base 1, the driving assembly is provided with a rotatable rotating part 2 and a non-rotatable fixing part 3, and the rotating part 2 is provided with a circumferential surface; the heliostat assembly is arranged on the rotating part 2, and the driving assembly drives the heliostat assembly to rotate; the open ends of the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B are fixedly connected to the rotating part 2, the bodies of the pull ropes are fixedly connected to the fixing part 3 of the driving assembly, and the rotating part 2 drives the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B to stretch; the strings of the string displacement sensor a and the string displacement sensor B are both in close contact with the circumferential surface of the rotating portion 2, and the arcs formed by the strings of both are coaxial with the rotation center of the rotating portion 2.
When the heliostat assembly is at the zero point position 12, the open ends of the stay ropes 10 of the stay rope displacement sensor A and the stay rope displacement sensor B are projected and overlapped in the axial direction of the rotation center of the rotating part 2, and the rest parts of the stay ropes are not overlapped; in the rotation process of the heliostat assembly, the rotating part 2 drives the stay rope displacement sensor A stay rope 9 and the stay rope displacement sensor B stay rope 10 to do circular arc telescopic motion on the circumferential surface, and the length value of the stay rope is in direct proportion to the rotation arc length of the rotating part 2, so that the stay rope length values of the stay rope displacement sensor A and/or the stay rope displacement sensor B can be converted into angle values to obtain the azimuth angle of the heliostat assembly. That is, the azimuth angle of the heliostat assembly is determined by the values of the tension signals of the stay wire displacement sensor a and the stay wire displacement sensor B.
The stay rope length value of the stay rope displacement sensor A and/or the stay rope displacement sensor B is converted into the angle value so as to obtain the azimuth angle of the heliostat assembly, so that the control of the azimuth angle of the heliostat is realized, the measured value is an absolute value, the measurement is more accurate, and the problem of angle deviation cannot occur.
The heliostat azimuth angle control apparatus of the present invention is explained in detail below:
the base 1 is a stand column and is used for bearing a driving assembly and a heliostat assembly, the driving assembly is arranged at the upper end of the base 1, and the heliostat assembly is arranged at the upper end of the driving assembly. In this embodiment, the driving assembly is a rotary speed reducer, the rotary speed reducer is mounted on the upper end of the base 1 through a flange, the fixed portion 3 is the flange, the rotating portion 2 is a rotary box body of the rotary speed reducer, and the circumferential surface of the rotating portion 2 is the circumferential outer surface of the rotary box body. And the stay rope 9 of the stay rope displacement sensor A and the stay rope 10 of the stay rope displacement sensor B are both in a horizontal state, so that the data are accurate.
When the rotating part 2 rotates to drive the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B to stretch, the tension degree of the stay ropes is unchanged by the spring in the body. The hub with the threads drives the precise rotary inductor to rotate, an electric signal proportional to the moving distance of the pull rope is output, and the rotation angle or speed of the heliostat assembly can be obtained by measuring the output signal.
Referring to fig. 1, the heliostat assembly comprises a push rod 4, a mounting rod 5 and a mirror 6, the mounting rod 5 being mounted on the rotary part 2 by means of corresponding mounting structures, the two mirrors 6 being mounted on the mounting rod 5.
Referring to fig. 2 and 3, fig. 2 and 3 show a state in which the heliostat assembly is in the zero point position 12, the stay wire displacement sensor a body 7 of the present embodiment is provided at the fixed part 3 and at the zero point position 12 of the heliostat assembly, and the stay wire displacement sensor B body 8 is provided on the fixed part 3 symmetrically to the stay wire displacement sensor a body 7 in the radial direction of the circumferential surface of the rotating part 2. And when the heliostat assembly is at the zero point position 12, the pull-cord open end 11 of the pull-cord displacement sensor a pull cord 9 and the pull-cord open end 11 of the pull-cord displacement sensor B pull cord 10 are positioned on the circumferential surface of the rotating part 2 between the pull-cord displacement sensor a body 7 and the pull-cord displacement sensor B body 8.
Example 2
Referring to fig. 1 to 5, another core of the present invention is to provide a heliostat azimuth angle control method, based on the heliostat azimuth angle control device of embodiment 1, including the following steps:
step 1: adjusting the heliostat component to a zero point position 12, and calibrating the azimuth angle of the heliostat component at the position to be 0 degree;
step 2: the values of the pull rope displacement sensor A and the pull rope displacement sensor B are respectively N when the zero point position 12 is recordedAAnd NBMeasured toThe arc angles corresponding to the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B are respectively theta at the zero point position 12AAnd thetaBAnd the values of the pull rope displacement sensor A and the pull rope displacement sensor B are respectively set to be L in the rotation process of the heliostat componentAAnd LB；
Theta can be measured by the angle acquisition moduleAAnd thetaBThe value displayed by the string displacement sensor a and the string displacement sensor B may be converted into θ by the diameter of the circumferential surface of the rotating part 2AAnd thetaB。
Step 3: when L is measured in the rotation process of the heliostat assemblyA-NA＞LB-NBThe azimuth angle θ of the heliostat assembly is:
when L is measured in the rotation process of the heliostat assemblyA-NA＜LB-NBThe azimuth angle θ of the heliostat assembly is:
in this example LA-NA＞LB-NBWhen the heliostat assembly rotates clockwise, the rotation is defined as positive rotation, LA-NA＜LB-NBThe heliostat assembly is rotated counterclockwise, which is defined as being reversed, i.e., the azimuth angle θ of the heliostat assembly has positive and negative values.
Referring to fig. 4-5, the heliostat assembly is shown in positive 180 degrees and negative 180 degrees azimuth, respectively. In embodiment 1, the string displacement sensor a body 7 and the string displacement sensor B body 8 are symmetrically arranged, and the open ends 11 of the strings of the two are located between the two, so N in this embodimentA＝NB，θA＝θB90 degrees.
The system is characterized by further comprising a processing module and a control module, the stay rope displacement sensor A, the stay rope displacement sensor B and the angle acquisition module send data to the processing module, the processing module calculates an actual azimuth angle of the heliostat assembly according to Step3, whether the heliostat assembly is within a preset angle range can be monitored in real time through calculation of the azimuth angle, if the heliostat assembly exceeds the preset angle range, an early warning is sent, and the control module immediately controls the heliostat assembly to stop rotating so as to prevent the heliostat assembly from winding.
Because the azimuth angle theta of the heliostat component has positive and negative values, the warning value of the azimuth angle theta can be set to be-360 degrees and not more than theta and not more than +360 degrees, if the azimuth angle theta exceeds the warning value range, the heliostat component is controlled to stop rotating, the heliostat component is prevented from rotating towards one rotating direction for too many turns, and the winding is effectively prevented.
The azimuth angle of the heliostat assembly is measured by the stay rope displacement sensor A and the stay rope displacement sensor B, and the signal value of the sensor is changed only according to the length of the stay rope, so the sensor is an absolute sensor. Stay cord displacement sensor A and stay cord displacement sensor B signal value can not zero clearing after the outage resets, can keep original value, so when heliostat subassembly emergency outage power-on again, can not have the risk that the angle that causes the angle skew of angle failure, improved system reliability and stability.
Therefore, the method is different from the conventional method, power-down storage is not needed, the heliostat assembly is positioned in a reference mode, only the pull rope displacement sensor A and the pull rope displacement sensor B are adopted, the control flow is simple, the cost is reduced, and the workload at the initial stage of construction of the mirror field is reduced to a great extent.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (5)
1. A heliostat azimuth angle control apparatus, comprising:
a base;
the driving assembly is arranged on the base and provided with a rotatable rotating part and a non-rotatable fixing part, and the rotating part is provided with a circumferential surface;
the heliostat assembly is arranged on the rotating part, and the driving assembly drives the heliostat assembly to rotate;
the pull rope displacement sensor A and the pull rope displacement sensor B are respectively provided with a pull rope displacement sensor A and a pull rope displacement sensor B, wherein the open ends of the pull ropes; the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are tightly attached to the circumferential surface, and the arcs formed by the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are coaxial with the rotation center of the rotating part;
when the heliostat assembly is in a zero point position, the open ends of the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are projected and superposed in the axial direction of the rotation center of the rotating part, and the rest parts of the stay ropes of the stay rope displacement sensor A and the stay rope displacement sensor B are not superposed; and in the rotation process of the heliostat assembly, converting the length value of the pull rope displacement sensor A and/or the pull rope displacement sensor B into an angle value to obtain the azimuth angle of the heliostat assembly.
2. A heliostat azimuth angle control apparatus according to claim 1, wherein the drive assembly is a slew reducer.
3. The heliostat azimuth angle control device according to claim 1, wherein the bodies of the stay wire displacement sensor a and the stay wire displacement sensor B are arranged radially symmetrically along the circumferential surface, and when the heliostat assembly is in a zero position, the open ends of the stay wires of the stay wire displacement sensor a and the stay wire displacement sensor B are located at a position intermediate between the bodies.
4. A heliostat azimuth angle control method based on the heliostat azimuth angle control device according to any one of claims 1 to 3, comprising:
step 1: adjusting the heliostat assembly to a zero point position, and calibrating the azimuth angle of the heliostat assembly at the position to be 0 degree;
step 2: the values of the pull rope displacement sensor A and the pull rope displacement sensor B are respectively N when the zero point position is recordedAAnd NBWhen the zero point position is obtained through measurement, the arc angles corresponding to the pull ropes of the pull rope displacement sensor A and the pull rope displacement sensor B are respectively thetaAAnd thetaBAnd the values of the stay rope displacement sensor A and the stay rope displacement sensor B are respectively L in the rotation process of the heliostat componentAAnd LB；
Step 3: when L is measured in the rotation process of the heliostat componentA-NA＞LB-NBThe azimuth angle θ of the heliostat assembly is:
when L is measured in the rotation process of the heliostat componentA-NA＜LB-NBThe azimuth angle θ of the heliostat assembly is:
5. the heliostat azimuth angle control method of claim 4, wherein θ measured by the angle acquisition module in Step2AAnd thetaB。
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